Is It Cheaper to Buy the ADR or the Ordinary Shares? Here's How to Check

If a company is listed on both a US exchange and its home-market exchange, you have a choice. Buy the ADR or buy the ordinary shares. Most investors just buy the ADR out of convenience. But the two prices are rarely identical, and sometimes the difference is large enough to matter.

Here's how to actually compare them.

The Comparison Problem

You can't just look at the ADR price and the home-market price and subtract. Three things make the comparison non-trivial:

1. Different currencies. If the underlying shares trade in AUD, GBP, EUR, or any currency other than USD, you need to convert at the current exchange rate. 2. The ADR ratio. One ADR doesn't necessarily represent one ordinary share. The ratio can be anything from 1:10 (one ADR represents a tenth of a share) to 5:1 (one ADR represents five shares). If you don't account for this, the comparison is meaningless. 3. Transaction costs and taxes. Even if the prices are equivalent, transaction costs differ. Buying foreign ordinary shares often involves higher brokerage fees, currency conversion costs, and potentially different tax treatment on dividends.

Doing It Manually

If you want to do the math yourself, here's the process:

1. Find the current ADR ratio. This is disclosed in the ADR prospectus and available from the depositary bank (usually J.P. Morgan, Citi, or Deutsche Bank). It's also on sites like ADR.com.

2. Get the current price of the ordinary shares in the home market, in local currency.

3. Get the current USD/local-currency exchange rate.

4. Calculate the ordinary share price in USD: home_price * exchange_rate.

5. Adjust for the ADR ratio: if one ADR = 2 ordinary shares, multiply by 2. If one ADR = 0.5 ordinary shares, divide by 2.

6. Compare the result to the current ADR price.

The difference, expressed as a percentage, is the premium (if ADR is more expensive) or discount (if ADR is cheaper).

Example: A company's ordinary shares trade on the ASX at AUD 5.80. The current AUD/USD rate is 0.63. One CDI (the ASX equivalent of an ADR) represents 1 underlying share.

• AUD 5.80 × 0.63 = USD 3.65 fair value
• If the US ADR trades at USD 3.85, the ADR is at a 5.5% premium

That means buying the ADR costs you an extra 5.5% compared to buying the underlying shares directly on the ASX. Worth knowing.

Doing It Automatically

If you'd rather not do this math every time you want to check a position, StockResearch does it automatically. Enter the two tickers, and you get a currency-normalized, ratio-adjusted price comparison with the spread plotted over time.

This matters more than a one-time check. Spreads change. A stock that traded at fair value last month might have drifted to a 3% premium this month. If you're building a position, you probably want to know which exchange currently offers the better entry price.

What the Spread Tells You

Once you have the number, it takes context to interpret it:

A small spread (0-2%) is usually just market noise: bid-ask spreads, FX friction, timing differences between markets. Not meaningful. A moderate spread (2-5%) may reflect the convenience premium of the ADR (accessible to US investors without a foreign brokerage) or temporary dislocation. Worth understanding the cause before drawing conclusions. A large spread (5%+) is unusual and often temporary. It can indicate a recent corporate event, a period of market stress that affected one market more than the other, or a structural issue with the ADR program. It can also represent a real opportunity if you can access both markets.

The Tax and Cost Reality Check

Even if the ordinary shares are technically cheaper, the all-in cost comparison needs to include:

Brokerage fees. Buying foreign ordinary shares often costs more per trade than buying US-listed ADRs. Some brokers charge a flat foreign trading fee or add a currency conversion markup. Dividend withholding taxes. If the company pays dividends, the treatment differs by country and by your tax situation. Sponsored ADRs handle currency conversion for you; direct foreign ownership may expose you to different withholding rates. Ongoing holding costs. ADR programs charge a small annual custody fee (usually a few cents per share per year), passed through as a deduction from dividends. Directly held foreign shares may have different custody structures. Currency conversion timing. When you buy ordinary shares, you're converting currency at the moment of purchase. With ADRs, the currency exposure is already embedded in the price. Neither is inherently better, but they're different.

Who Should Actually Buy Ordinary Shares

For most US retail investors, the ADR is the practical choice. The convenience is worth the small premium, especially on smaller positions where transaction cost differences would dominate any price advantage.

The calculation shifts if:

• You're making a large enough position that a 3-4% price difference is meaningful in dollar terms
• You already have a foreign brokerage account (Interactive Brokers, for example, gives access to most major foreign markets)
• The ADR is illiquid or has wide bid-ask spreads, making execution on the US exchange difficult
• The spread has been persistently large and you believe it will close

The Practical Takeaway

Most of the time, for most investors, the ADR is fine. But knowing the current spread gives you an edge: you know what you're paying, you can pick your moment, and you can recognize when an unusual dislocation is worth acting on.

Check the spread before you build a significant position. It takes 30 seconds with the right tool and can save you real money.

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StockResearch compares ADR and ordinary share prices automatically, with real-time FX conversion and ratio adjustment. Free, no account needed.